Patch "serial: imx: Only wakeup via RTSDEN bit if the system has RTS/CTS" has been added to the 4.15-stable tree

This is a note to let you know that I've just added the patch titled

serial: imx: Only wakeup via RTSDEN bit if the system has RTS/CTS

to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
serial-imx-only-wakeup-via-rtsden-bit-if-the-system-has-rts-cts.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Fabio Estevam <[email protected]>
Date: Thu, 4 Jan 2018 15:58:34 -0200
Subject: serial: imx: Only wakeup via RTSDEN bit if the system has RTS/CTS

From: Fabio Estevam <[email protected]>

commit 38b1f0fb42f772b8c9aac53593883a18ff5eb9d7 upstream.

The wakeup mechanism via RTSDEN bit relies on the system using the RTS/CTS lines, so only allow such wakeup method when the system actually has RTS/CTS support.

---
 drivers/tty/serial/imx.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

@@ -2238,12 +2238,14 @@ static void serial_imx_enable_wakeup(str
 		val &= ~UCR3_AWAKEN;
 	writel(val, sport->port.membase + UCR3);
 
-	val = readl(sport->port.membase + UCR1);
-	if (on)
-		val |= UCR1_RTSDEN;
-	else
-		val &= ~UCR1_RTSDEN;
-	writel(val, sport->port.membase + UCR1);
+	if (sport->have_rtscts) {
+		val = readl(sport->port.membase + UCR1);
+		if (on)
+			val |= UCR1_RTSDEN;
+		else
+			val &= ~UCR1_RTSDEN;
+		writel(val, sport->port.membase + UCR1);
+	}
 }
 
 static int imx_serial_port_suspend_noirq(struct device *dev)

Patches currently in stable-queue which might be from [email protected] are

queue-4.15/serial-imx-only-wakeup-via-rtsden-bit-if-the-system-has-rts-cts.patch